First video of Minecraft's new biomes

Notch has just uploaded a video to YouTube showing off biomes, one of the new additions coming this weekend in Minecraft's Halloween update. Right now in Minecraft you either generate a snow world or a grass world, but biomes are multiple different environments within the same randomly generated world. That means that you'll be able to start in a grassy world but venture outward and eventually reach snow, desert, or more. Check the video below.